1436556421 has 2 divisors, whose sum is σ = 1436556422. Its totient is φ = 1436556420.

The previous prime is 1436556409. The next prime is 1436556463. The reversal of 1436556421 is 1246556341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1435576321 + 980100 = 37889^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1436556421 - 2¹¹ = 1436554373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1436556481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 718278210 + 718278211.

It is an arithmetic number, because the mean of its divisors is an integer number (718278211).

Almost surely, 2^1436556421 is an apocalyptic number.

It is an amenable number.

1436556421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1436556421 is an equidigital number, since it uses as much as digits as its factorization.

1436556421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 37.

The square root of 1436556421 is about 37901.9316262377. The cubic root of 1436556421 is about 1128.3423684203.

The spelling of 1436556421 in words is "one billion, four hundred thirty-six million, five hundred fifty-six thousand, four hundred twenty-one".